Having used the iPhone interface for Facebook for a few months now, I’m convinced that smart phones are the natural environment for FB and its applications. So it makes perfect sense to me that Nokia is making a deal to put Facebook prominently on all of its phones.
In fact, I’d go even farther. Having my Facebook contacts on my phone is almost more important than my phone’s own address book. Facebook could and should become a cell-phone operating system in its own right.